我有一个传统的Tibco SOAP服务，我需要从中获取一些数据。不幸的是，这项服务非常特别关于请求消息上的XML命名空间属性。在使用PeopleSoft（https://en.wikipedia.org/wiki/PeopleCode）的服务时，我也遇到了这类问题。
我从服务中获得了.wsdl并创建了一个服务引用。
开箱即用，.Net生成的XML请求消息是：
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<getLocation xmlns="http://customNamespaceHere">
<context>
<source>SysAdmin</source>
</context>
<Address>
<address1>123 Main St</address1>
<city>New York</city>
<state>NY</state>
<country>US</country>
</Address>
</getLocation>
</s:Body>
</s:Envelope>
实际上是什么（我用SoapUI想出来的）：
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<getLocation xmlns="http://customNamespaceHere">
<context>
<source>SysAdmin</source>
</context>
<Address>
<address1>123 Main St</address1>
<city>New York</city>
<state>NY</state>
<country>US</country>
</Address>
</getLocation>
</s:Body>
</s:Envelope>
注意body标签中缺少xsi和xsd前缀。
问：如何让.Net发送正确的XML，而不是手动滚动XML文档并手动将其发送到服务？
答案 0 :(得分：1)
答：我可以通过实现IClientMessageInspector在发送之前修改XML请求。
首先，我必须通过实现IClientMessageInspector来扩展WCF。这使我可以访问请求对象并修改XML请求消息。这些类不需要在您的解决方案中的任何特定位置（据我所知）。
public class ExtendedClientMessageInspector : IClientMessageInspector
{
// Here we can alter the xml request body before it gets sent out.
public object BeforeSendRequest(ref Message request, IClientChannel channel)
{
return TibcoService.ModifyGetLocationRequest(ref request);
} // end
public void AfterReceiveReply(ref Message reply, object correlationState)
{
return;
} //end
} // end class
public class ExtendedEndpointBehavior : IEndpointBehavior
{
public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
{
return;
} // end
public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
{
clientRuntime.MessageInspectors.Add(new ExtendedClientMessageInspector());
} // end
public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
{
return;
} // end
public void Validate(ServiceEndpoint endpoint)
{
return;
} // end
} // end class
public class EndpointBehaviorExtensionElement : BehaviorExtensionElement
{
protected override object CreateBehavior()
{
return new ExtendedEndpointBehavior();
} // end
public override Type BehaviorType
{
get
{
return typeof(ExtendedEndpointBehavior);
}
} // end
} // end class
我确实将与此服务中的XML有关的方法放在与服务相同的类中：
public static Message ModifyGetLocationRequest(ref Message request)
{
// Initialize objects
var xmlDocument = new XmlDocument();
var memoryStream = new MemoryStream();
var xmlWriter = XmlWriter.Create(memoryStream);
var xmlAttribute = xmlDocument.CreateAttribute("xmlns", "api", "http://www.w3.org/2000/xmlns/");
xmlAttribute.Value = "http://customNamespaceHere";
// Write the xml request message into the memory stream
request.WriteMessage(xmlWriter);
// Clear the xmlWriter
xmlWriter.Flush();
// Place the pointer in the memoryStream to the beginning
memoryStream.Position = 0;
// Load the memory stream into the xmlDocument
xmlDocument.Load(memoryStream);
// Remove the attributes from the second node down form the top
xmlDocument.ChildNodes[1].ChildNodes[1].Attributes.RemoveAll();
// Reset the memoryStream object - essentially nulls it out
memoryStream.SetLength(0);
// ReInitialize the xmlWriter
xmlWriter = XmlWriter.Create(memoryStream);
// Write the modified xml request message (xmlDocument) to the memoryStream in the xmlWriter
xmlDocument.WriteTo(xmlWriter);
// Clear the xmlWriter
xmlWriter.Flush();
// Place the pointer in the memoryStream to the beginning
memoryStream.Position = 0;
// Create a new xmlReader with the memoryStream that contains the xmlDocument
var xmlReader = XmlReader.Create(memoryStream);
// Create a new request message with the modified xmlDocument
request = Message.CreateMessage(xmlReader, int.MaxValue, request.Version);
return request;
} // end
要在调用服务时将其全部工作，您需要修改web.config或app.config。在端点声明中，您需要指定一个behaviorConfiguration元素，如下所示：
<client>
<endpoint address="http://1.2.3.4:1234/InventoryBinding"
binding="basicHttpBinding" bindingConfiguration="HttpSoapBinding"
contract="TibcoSvc.InventoryPort" name="InventoryPort"
behaviorConfiguration="clientInspectorsAdded" />
</client>
您还需要指定扩展名和行为：
<system.serviceModel>
<extensions>
<behaviorExtensions>
<add name="ExtendedEndpointBehavior" type="Sample.Integrations.EndpointBehaviorExtensionElement, Sample.Integrations, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null" />
</behaviorExtensions>
</extensions>
<behaviors>
<endpointBehaviors>
<behavior name="clientInspectorsAdded">
<ExtendedEndpointBehavior />
</behavior>
</endpointBehaviors>
</behaviors>
</system.serviceModel>
请注意，扩展名称必须与以下内容完全相同：
var foo = typeof(<PutYourNamespaceHereNoAngleBrackets>.EndpointBehaviorExtensionElement).AssemblyQualifiedName;
以下是我发现的一些有用的链接：
http://weblogs.asp.net/paolopia/writing-a-wcf-message-inspector